all of our drivers must take e.v.o.c. before they can drive on a call. our chief eng. must also "sign off" on each driver. as a former chief eng. i would go out with people before they would take evoc and try and help them get comfortable with the vehicle. then , when i felt they were doing well enough, i would suggest to them to take the evoc. thats how we do it, don't really know how anyone else does!!